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LA-850A Fast Wireless Switch Roaming Transmission Equipment

Main Products: wireless monitoring, wireless monitoring equipment, wireless video transmission, wireless monitoring system, wireless video monitoring


LA-850A is a dedicated high-power wireless bridge supporting 300M IEE802.11AN fast roaming. It has high-end features such as high power, high bandwidth, easy installation and debugging, and full channels. The actual effective maximum bandwidth is up to 160M in both directions. Under the condition of omnidirectional antenna communication, the communication distance can reach more than 2 kilometers, and each base station can access 20-30 driving test vehicles; it can be widely used for driving network data transmission of subject two, subject three, cruise ships, rail transit, railways, etc. With advanced functions such as online scanning, pre-connection, and intelligent path learning, it can provide high-bandwidth, no-delay data roaming services in high-speed mobile environments.

I. Features

High power: The high power output is 30dBm, and the high EVM value of 3% can still be guaranteed at the maximum power.  

Wide voltage: support 9-48V ultra-wide voltage support, and support battery, standard and non-standard POE power supply, greatly simplifying installation complexity.  

Long communication distance: using the omnidirectional antenna can reach an effective communication distance of more than 2 kilometers, which greatly reduces the overall cost and construction difficulty.

Millisecond-level handover speed: The average delay of the LA-850A handover base station is 35 milliseconds, and the ping has no packet loss.  

Cross-channel work: The base station can choose different channels, and the on-vehicle end can switch across channels. The same number of base stations can greatly provide the entire system capacity.  

Intelligent learning: The vehicle will continuously learn the current driving switch path automatically, and will prioritize the previously learned path before preparing to switch to improve the switching efficiency.  

Simple to use: After a large number of actual environment measurements, a large number of optimized parameters and real-time measurement functions are built in, leaving only a few parameters that need to be set according to the environment passed by the user.

WEB adjustment greatly reduces the user's on-site debugging difficulty. With basic wireless foundation, installation and debugging can be completed without the need for professionals.  

Highly customized: The LA-850A supports both base station and vehicle use. You only need to modify the working mode, and the operation settings are simplified.


RF parameters







1000mW ESD MIMO AP











TX SPECIFICATIONS









DataRate

TX Power


TX Power


Tolerance







(Single channel)


(Dual channel)







6-24Mbps


27dBm


30dBm



± 2db














802.11a


36Mbps


27dBm


30dBm



± 2dB













48Mbps


26dBm


29dBm



± 2dB
























54Mbps


25dBm


28dBm



± 2dB






























TX

TX





TX

TX



DataRate

Power

Power

Tolerance



DataRate

Power

Power

Tolerance




(per chain)

(2 chains)





(per chain)

(2 chains)
















MCS 0/8

26dBm

29dBm

± 2dB



MCS 0/8

26dBm

29dBm

± 2dB















MCS 1/9

25dBm

28dBm

± 2dB



MCS 1/9

25dBm

28dBm

± 2dB














5GHz

MCS 2/10

25dBm

28dBm

± 2dB



MCS 2/10

25dBm

28dBm

± 2dB













MCS 3/11

25dBm

28dBm

± 2dB


5GHz

MCS 3/11

25dBm

28dBm

± 2dB

11n













MCS 4/12

25dBm

28dBm

± 2dB


MCS 4/12

25dBm

28dBm

± 2dB

HT 20


11n







HT 40






MCS 5/13

25dBm

28dBm

± 2dB


MCS 5/13

25dBm


28dBm

± 2dB



















MCS 6/14

25dBm

28dBm

± 2dB



MCS 6/14

25dBm

28dBm

± 2dB















MCS 7/15

25dBm

28dBm

± 2dB



MCS 7/15

25dBm

28dBm

± 2dB















MCS 7/15

25dBm

28dBm

± 2dB



MCS 7/15

25dBm

28dBm

± 2dB



















RX SPECIFICATIONS




















DataRate

Sensitivity

Tolerance



DataRate

Sensitivity

Tolerance


(2 chains)



(2 chains)























6M

-96dBm

± 2dB



24M

-89dBm

± 2dB














802.11a

9M

-96dBm

± 2dB


802.11a

36M

-86dBm

± 2dB












12M

-95dBm

± 2dB


48M

-82dBm

± 2dB


















18M

-93dBm

± 2dB



54M

-79dBm

± 2dB















MCS0

-95dBm

± 2dB



MCS0

-92dBm

± 2dB














5GHz

MCS1

-93dBm

± 2dB


5GHz

MCS1

-90dBm

± 2dB

11n

MCS2

-90dBm

± 2dB


11n

MCS2

-87dBm

± 2dB

HT 20







HT 40






MCS3

-89dBm

± 2dB


MCS3

-84dBm

± 2dB















MCS4

-85dBm

± 2dB



MCS4

-81dBm

± 2dB




















1000mW ESD MIMO AP











TX SPECIFICATIONS









DataRate

TX Power


TX Power


Tolerance







(Single channel)


(Dual channel)







6-24Mbps


27dBm


30dBm



± 2dB














802.11a


36Mbps


27dBm


30dBm



± 2dB













48Mbps


26dBm


29dBm



± 2dB
























54Mbps


25dBm


28dBm



± 2dB






























TX

TX





TX

TX



DataRate

Power

Power

Tolerance



DataRate

Power

Power

Tolerance




(Single channel)

(Dual channel)





(Single channel)

(Dual channel)
















MCS 0/8

26dBm

29dBm

± 2dB



MCS 0/8

26dBm

29dBm

± 2dB















MCS 1/9

25dBm

28dBm

± 2dB



MCS 1/9

25dBm

28dBm

± 2dB














5GHz

MCS 2/10

25dBm

28dBm

± 2dB



MCS 2/10

25dBm

28dBm

± 2dB













MCS 3/11

25dBm

28dBm

± 2dB


5GHz

MCS 3/11

25dBm

28dBm

± 2dB

11n













MCS 4/12

25dBm

28dBm

± 2dB


MCS 4/12

25dBm

28dBm

± 2dB

HT 20


11n







HT 40






MCS 5/13

25dBm

28dBm

± 2dB


MCS 5/13

25dBm


28dBm

± 2dB



















MCS 6/14

25dBm

28dBm

± 2dB



MCS 6/14

25dBm

28dBm

± 2dB















MCS 7/15

25dBm

28dBm

± 2dB



MCS 7/15

25dBm

28dBm

± 2dB















MCS 7/15

25dBm

28dBm

± 2dB



MCS 7/15

25dBm

28dBm

± 2dB















MCS5

-81dBm

± 2dB



MCS5

-77dBm

± 2dB















MCS6

-79dBm

± 2dB



MCS6

-76dBm

± 2dB















MCS7

-75dBm

± 2dB



MCS7

-74dBm

± 2dB














      



Third, the working principle  

LA-850A is based on five main technologies: online scanning, CCQ sequencing, intelligent learning, pre-connection, and data caching. The working principle is as follows. In the state that the vehicle-mounted device is connected to the current base station, the multi-channel scanning is performed through the idle interval, and then the scanning results are sorted by CCQ weight. When the set threshold is reached, the pre-connection operation is performed according to the priority list After the new base station receives the pre-connection instruction, it will broadcast other base stations to hand over authentication data and uncompleted data packets. After receiving the handover data from the current base station, the base station will be switched at an appropriate time. If the vehicle still has data at this time, If the data is not transmitted, the data will be buffered by the vehicle. When the new base station is successfully connected, the new base station will forward the data.
After each handover process is completed, the intelligent learning module will actively learn the next base station that may be handed over, and will preferentially detect the previous base station path in subsequent handovers. The delay of the entire switching process can be controlled between 20-35mS, no data loss, and no impact on video, audio, and control data.



Product Specifications

Power: DC interface supports 9-48V power supply, RJ45 supports 15-48V various standard non-standard POE  

Temperature: -40 to 65 degrees Celsius

Interface: 10M / 100M RJ45 * 2


V. Application method

LA-850A is a highly customized fast-switching product, so its installation and commissioning is very simple, specifically divided into two parts: base station installation and vehicle parameter adjustment. Base station installation. The base station installation needs to ensure that the Layer 2 links between all base stations are unblocked. It can be unified access switch aggregation through fiber optics (recommended), and can be transparently transmitted through bridges where fiber is not convenient. -5839 products. Just set the following parameters to complete the setting.


Six, base station protocol mode

IP address: used to manage the AP;

ESSID: The vehicle end is based on ESSID as the basis for roaming. If you plan to use multiple systems, you can use different ESSIDs to distinguish them.

Channel: Supports up to 34 20M channels and 17 40M channels, which can meet all application scenarios. 尽可能的减少信道使用量,以降低车载端的扫描时间) Channels can be staggered between base stations to increase system capacity (Note: reduce the channel usage as much as possible to reduce the scan time on the vehicle)

Distance optimization: According to the site environment, a value greater than 20% of the actual farthest distance can be set, in meters (for example: the longest distance from the base station to the car is 800 meters, we can set it to 1000 meters).  

Encryption, password: In order to simplify the use, we have restricted the use of WPA2 as an advanced encryption method. (Note: using encryption will increase the switching time by 20mS)  

Hide ESSID: If you do not use the encryption function, it is recommended to enable this function module, so as to avoid unnecessary system burden caused by other network equipment on the site accessing this network.

Vehicle-side installation and commissioning. Vehicle-side installation is mainly divided into two parts: parameter setting and parameter optimization.


Seven, vehicle terminal protocol mode

ESSID: Set the ESSID of the current network, which is consistent with the base station, and the vehicle identifies the network through the ESSID.

Scanning channel: According to the settings of all base stations, limit the channel list scanned by the vehicle. This setting will help improve the work efficiency.

Enable fast switching: intelligent (can learn paths); normal (through threshold control)  

Close signal threshold: This value system is used to judge whether the current environment needs to speed up scanning. 号小于这个值的时候,系统会使用最小间隔时间设置的参数加速扫描,当前信号大于这个值的时候,系统会使用最大间隔时间减少扫描次数,在没有完成预连接前不会断开当前连接。) (Note: This value is not a parameter for disconnecting the network. When the current signal is less than this value, the system will use the parameter set by the minimum interval time to speed up the scan. When the current signal is greater than this value, the system will use the maximum interval time to reduce Number of scans, the current connection will not be disconnected before the pre-connection is completed.)

Minimum interval: the scan time when the current signal is less than the threshold;

Maximum interval: the scanning time when the current signal is greater than the threshold;

IP address: Because the cache address is used, please consult the equipment supplier for the client IP address setting;


Vehicle-end parameter optimization  

The optimization of the vehicle side is mainly to optimize the three three parameters according to the needs of the entire environment: "threshold", "minimum interval", "maximum interval"

Just-in-time connection information: The first line is the just-in-time connection data of the current connection, which can appropriately judge the signal quality, connection rate and other parameters of the current connection.

Current environment list: The table below the timely connection information is the MAC address, SSID, signal strength, channel, signal noise, and current connection parameters of all the base station lists in the current environment detected by the vehicle.


Optimization suggestion: After installing all base stations, first install a car terminal, set the relevant parameters, run a few laps on the road on the scene, and record the lowest signal value of the current connected signal. Calculate and set this value as the "threshold value". Generally, it is recommended that the average value is -70dBm. Below -65dBm will get better stability. If this value is lower than -70dBm or does not meet the design expectations, you should increase the number of base stations to adjust Repeat the above operations for the base station location. The recommended minimum interval is 1-3 seconds, and the maximum interval is 10-20 seconds.

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